After spinning for a bit, the system will give you an alert. Note it can take several minutes (It's taken up to 30 mins before, depending on time of day [am is busier computer loads than later]. Do not refresh! Be patient.

See the confirmation screen here:

(2) PORTAL API

PORTAL > Left Nav "Publisher" > Search for Pub ID > Click the "cloud with a down arrrow"

The System will also spin. You will see message at the bottom left "waiting for portal.digitalthrottle.com". Don't refresh or leave page. Won't take as long as #1, but be patient.

FINAL: to verify everything has "come over". Login as the publisher.

Click on "Ad Tags". You should see the placement groups and placments in AppNexus: